TC7129 Data Sheet

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  TC7129 Data Sheet


The TC7129 is a 4-1/2 digit analog-to-digital converter (ADC)that directly drives a multiplexed liquid crystal display (LCD).Fabricated in high-performance,low-power CMOS, the TC7129 ADC is designed specifically for high-resolution, battery-powered digital multimeter applications. The traditional dual-slope method of A/D conversion has been enhanced with a successive integration technique to produce readings accurate to better than 0.005% of full scale, and resolution down to 10µV per count. The TC7129 includes features important to multimeter applications.It detects and indicates low-battery condition. A continuity output drives an annunciator on the display, and can be used with an external driver to sound an audible alarm.Overrange and underrange outputs and a range-change input provide the ability to create auto-ranging instruments.For snapshot readings,the TC7129 includes a latch-and-hold input to freeze the present reading. This combination of features makes the TC7129 the ideal choice for full-featured multimeter and digital measurement applications.
Parameter Name  Value
Supply Voltage (V)  9
Power (mW)  4.5
Hold Function  No
For DMM, DPM, data loggers  No
Resolution (Digits)  4.5
Resolution (Counts)  20000
Display Type  LCD  
Temp. Range (°C)  0 to 70

     Features
- Low Temperature Drift Internal Reference
     TC7126...............80 ppm/°C Typ.
     TC7126A...............35 ppm/°C Typ.
- Guaranteed Zero Reading With Zero Input
- Low Noise: 15µVP-P
- High Resolution: 0.05%
- Low Input Leakage Current: 1pA Typ. 10pA Max
- Precision Null Detectors With True Polarity at Zero
- High-Impedance Differential Input
- Convenient 9V Battery Operation With Low Power  Dissipation: 500Ω
Typ. 900W Max


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